| Chinese Heritage Limited | Education | 1990 |
| Chirpea Ltd | Professional & scientific | 2023 |
| Chiswick Furniture Galleries Limited | Real estate | 1929 |
| Choam Limited | Professional & scientific | 2024 |
| Cholderton Rare Breeds Farm Park LLP | | 2005 |
| Cholderton Sporting Services Ltd | Agriculture & fishing | 2021 |
| Chordal Management Limited | Professional & scientific | 2019 |
| Chosen View (NO. 2) Management Company Limited | Households | 2013 |
| Chris D Consultancy Limited | Administrative & support | 2016 |
| Chris Gadeke Physiotherapy Limited | Health & social care | 2011 |
| Chris Howitt Consulting Ltd | Professional & scientific | 2012 |
| Chris Little Events Ltd | Information & communication | 2026 |
| Chris Mould Limited | Information & communication | 2007 |
| Chris Wadge Clocks Limited | Other services | 2003 |
| Christine Dando Bridals Limited | Wholesale & retail | 2016 |
| Christopher Cook Designs Limited | Professional & scientific | 1988 |
| Chromosome Recruitment Ltd | Professional & scientific | 2020 |
| Chubby Dumpling Ltd | Hospitality | 2019 |
| Chunky Monkey Ltd | Hospitality | 2023 |
| Church Court (Keresley) Management Limited | Real estate | 1997 |
| Church Farm Sixpenny Management Company Limited | Households | 2019 |
| Church Farms (Wiltshire) Ltd | Agriculture & fishing | 1964 |
| Church Mead (Tisbury) Management Company Limited | Households | 2008 |
| Church Mews Owners Limited | Households | 2004 |
| Church Street Properties Ltd | Real estate | 2011 |
| Churchill Place RTM Company Limited | Households | 2022 |
| Churston House (Salisbury) Management Company Limited | Households | 1989 |
| Chutneys of Salisbury Ltd | Hospitality | 2026 |
| CI Precision Limited | Manufacturing | 1965 |
| Cilgant Parc Llandaf Management Company Limited | Households | 2026 |
| Cineaero Limited | Manufacturing | 2021 |
| Cinearray Limited | Information & communication | 2023 |
| Cinegroup Limited | Financial services | 2023 |
| Cinemapper Limited | Information & communication | 2024 |
| Cinetracking Limited | Administrative & support | 2023 |
| Circir Ltd | Hospitality | 2023 |
| Circles South West | Health & social care | 2010 |
| Circuitbyte Ltd | Manufacturing | 2014 |
| Citrine Helix Limited | Professional & scientific | 2020 |
| City Hall Events Ltd | Arts & recreation | 2024 |
| City of Salisbury Athletics and Running Club Ltd | Arts & recreation | 2015 |
| CITY2SPORT Limited | Administrative & support | 2025 |
| Citybrisk Developments Limited | Construction | 1998 |
| Ciufoli Ltd | Manufacturing | 2024 |
| Cjhl Ltd | Professional & scientific | 2023 |
| CJM Carpentry Limited | Construction | 2002 |
| CK Building Limited | Construction | 2024 |
| CK QPS Holdings Ltd | Financial services | 2023 |
| CK Quality Pharma Solutions Ltd | Professional & scientific | 2022 |
| CK Quality Property Solutions Ltd | Real estate | 2023 |
| Ckpweld Services Ltd | Other services | 2014 |
| CKS Consultancy Limited | Professional & scientific | 2025 |
| Clanchy & Co Ltd | Professional & scientific | 2008 |
| Clarence Court Management Company (2000) Limited | Real estate | 2000 |
| Clarence PUB Ltd | Hospitality | 2026 |
| Clarendon Chase Management Company Limited | Real estate | 1992 |
| Clarendon Consulting Services Limited | Administrative & support | 2018 |
| Clarendon Court (Winchester) Management Company Limited | Households | 2015 |
| Clarendon Park Estate Limited | Financial services | 2017 |
| Clarendon Park Farms Limited | Agriculture & fishing | 2006 |
| Clarendon Park Shoot Club Limited | Arts & recreation | 2011 |
| Clarendon Place Residents Co Limited | Households | 2016 |
| Clarendon RD Apartments Ltd | Real estate | 2025 |
| Clarity Business Consultancy Ltd | Professional & scientific | 2024 |
| Clarity Business Consultants Ltd. | Information & communication | 1997 |
| Clark Frost Construction Ltd | Construction | 2014 |
| Clarks Glass Limited | Manufacturing | 2025 |
| Classical Order Limited | Real estate | 1999 |
| Claudia Bradby Limited | Manufacturing | 2001 |
| Claybush Road (Ashwell) Management Company Limited | Households | 2020 |
| Clayfield Developments Limited | Construction | 2018 |
| Clayfield Southern Ltd | Real estate | 2023 |
| Claygate Interior Design Limited | Professional & scientific | 2012 |
| Clayson Investments Limited | Real estate | 2022 |
| Clayton Ponting Limited | Wholesale & retail | 1958 |
| Clcs Wellbeing Ltd | Health & social care | 2025 |
| Clean Living (Amesbury) Ltd | Administrative & support | 2024 |
| Cleantech Support Services Limited | Administrative & support | 2025 |
| Cleanup United Kingdom | Other services | 2007 |
| Clear CUT Images Limited | Information & communication | 2004 |
| Clear Ridge Limited | Professional & scientific | 2020 |
| Clearly Creative Limited | Professional & scientific | 2026 |
| Clearwater Advantage Limited | Professional & scientific | 2016 |
| Clearwave IT Limited | Information & communication | 2025 |
| Clearway Kennels Limited | Other services | 2020 |
| Clearway Pets Limited | Wholesale & retail | 2020 |
| Clearway Pools and Spas South Wiltshire Ltd | Professional & scientific | 2025 |
| Clemo Family Investment Company Ltd | Financial services | 2022 |
| Clevah | Professional & scientific | 2016 |
| Client Support Solutions Limited | Administrative & support | 2023 |
| Clifford FRY & Co (Company Secretarial) Ltd | Administrative & support | 2001 |
| Clifford FRY & Co LLP | | 2005 |
| Clifford Solutions Limited | Administrative & support | 2004 |
| Clifton Multimedia Limited | Information & communication | 2000 |
| Climate Hubs & Outreach Wiltshire CIC | Professional & scientific | 2025 |
| Clinical Narratives Limited | Health & social care | 2024 |
| Cliodna Ltd | Wholesale & retail | 2024 |
| Clipper Enterprises Limited | Wholesale & retail | 2009 |
| Clive Motor Works LLP | | 2013 |
| Cliveden Land Limited | Construction | 1992 |